Compress PDF Online Free
Reduce file size while optimizing for maximal PDF quality with selectable compression levels. 100% private client-side processing in your browser with zero server uploads.
Click to select file or drag & drop here
Supported formats: application/pdf • Processed 100% locally in your browser
How to Use Compress PDF Online
Select PDF to Shrink
Upload any large PDF file you need to compress for email or portal uploads.
Pick Compression Level
Choose Extreme Compression (smallest size), Recommended Compression, or Lossless Stream Optimization.
Download Smaller PDF
View your exact percentage saved and download the compressed PDF immediately.
Frequently Asked Questions — Compress PDF
Which compression mode reduces file size the most?
Extreme and Recommended modes downsample heavy embedded page bitmaps while optimizing PDF object streams.
What does Lossless Optimization do?
It strips redundant metadata, unused objects, and compresses internal PDF streams without touching image resolution.
Can I compress PDFs for 2MB / 5MB portal limits?
Yes, you can inspect the exact output KB/MB size right on screen and adjust the quality slider if needed.